Gas hydraulic spring for crushing apparatus

Claim 1

IN A CRUSHING DEVICE OF THE ROLL TYPE HAVING A FRAME AND A PAIR OF SPACED CRUSHING ELEMENTS JOURNALED AT EACH OF THEIR AXIAL ENDS FOR ROTATION ON SAID FRAME ADAPTED TO CRUSH MATERIAL THEREBETWEEN BY ROTATION OF SAID ELEMENTS WITH RESPECT TO EACH OTHER, AT LEAST ONE OF SAID ELEMENTS BEING MOVABLE WITH RESPECT TO THE OTHER IN ORDER TO ADJUST THE SPACING THEREBETWEEN, THE COMBINATION THEREWITH OF GAS HYDRAULIC MEANS FOR MAINTAINING A PREDETERMINED SPACING BETWEEN SAID ELEMENTS DURING THEIR CRUSHING OPERATION UP TO A PREDETERMINED LOAD AND THEREAFTER TO ACCOMMODATE AN OVERLOAD BY RESILIENTLY INCREASING SAID SPACING, SAID MEANS COMPRISING AT LEAST ONE CYLINDER CLOSED AT AT LEAST ONE OF ITS TWO ENDS, A PISTON SLIDABLY MOUNTED IN SAID CYLINDER BETWEEN SAID ENDS, AND A COMPRESSIBLE FLUID UNDER PRESSURE BETWEEN SAID PISTON AND SAID CLOSED END, ONE OF SAID MEANS BEING OPERATIVELY ASSOCIATED WITH EACH JOURNAL OF SAID MOVABLE ELEMENT SO THAT THRUST BETWEEN SAID ELEMENTS IS COMMUNICATED TO SAID CYLINDER AND PISTON AGAINST THE PRESSURE OF SAID FLUID, THE PRESSURE IN EACH OF SAID CYLINDERS BEING SUCH THAT THE TOTAL FORCE EXERTED BY ALL OF SAID MEANS IS SUFFICIENT TO MAINTAIN SAID PREDETERMINED SPACING BETWEEN SAID ELEMENTS UP TO SAID PREDETERMINED LOAD ONLY, THERE BEING NO EXPULSION OF SAID FLUID FROM SAID CYLINDER WHEN SAID PREDETERMINED LOAD IS EXCEEDED, AND MEANS FOR ADJUSTING THE SPACING BETWEEN SAID ELEMENTS, SAID ADJUSTING MEANS BEING EFFECTIVE INDEPENDENTLY OF SAID FLUID IN SAID CYLINDER.